JP3829855B2 - Imaging device with image stabilization mechanism - Google Patents

Description

  The present invention relates to an imaging apparatus provided with a mechanism for correcting camera shake by moving an imaging element in two orthogonal directions.

  Conventionally, as an imaging apparatus of this type, Patent Document 1 discloses a substantially B-shaped base member, a first B-shaped slider attached to the base member and moved in a first direction by a first actuator, An image pickup apparatus including a camera shake correction mechanism that includes a second slider that is attached to the first slider and is moved in a second direction orthogonal to the first direction by a second actuator and that holds an image pickup element is disclosed. Yes.

  Patent Document 2 discloses an imaging apparatus in which an imaging element held by a substantially L-shaped holding member is moved in the horizontal direction and the vertical direction using two piezoelectric elements.

JP 2003-110929 A JP-A-9-116910

  However, in the imaging apparatus disclosed in Patent Document 1, the outer shape of the camera shake correction mechanism is large because the substantially slider-shaped first slider surrounds the four sides of the second slider that holds the imaging element. There's a problem.

  Further, in the imaging apparatus disclosed in Patent Document 2, there are elements that can be miniaturized because the holding member that holds the imaging element is formed in a substantially L shape, but the imaging element is perpendicular to the optical axis direction. There is a problem that a so-called sag is easily generated.

Therefore, in order to solve the above problem, the imaging apparatus of the present invention includes a base member fixed in the imaging apparatus,
The base member is movably attached to the base member via a first actuator and has an L-shape composed of two sides orthogonal to or crossing each other. The first actuator moves along the first side of the two sides. A first slider moved in a first direction;
An imaging device that is movably attached to the first slider via a second actuator and that is moved by the second actuator along a second side of the first slider in a second direction perpendicular to the first direction. A second slider holding the element;
A first rotation preventing portion for preventing rotation of the first slider with the first direction as a central axis;
A second anti-rotation portion that prevents the second slider from rotating about the second direction as a central axis, and the base member is L-shaped so as to overlap the first slider, thereby preventing the first anti-rotation And the second rotation preventing portion is provided near the end of the second side of the first slider farthest from the first actuator, and the second anti-rotation portion is the first side of the base member farthest from the second actuator. It is characterized by being provided in the vicinity of the end of the.

  In the imaging apparatus of the present invention, the first actuator may be fixed on the base member, and the second actuator may be attached to the second slider.

  In the imaging device of the present invention, the first actuator may be fixed on the base member, and the second actuator may be attached to the first slider.

  In the imaging apparatus of the present invention, the first and second actuators include an ultrasonic linear actuator including a weight, an electromechanical transducer connected to the weight, and a rod connected to the electromechanical transducer. It may be.

  In the imaging device of the present invention, the first slider and the second slider may be frictionally joined to the rods of the first and second actuators, respectively.

  In the imaging device of the present invention, the friction joint portion may be configured by sandwiching the rod between a V-shaped groove and a cap.

  In the imaging device according to the aspect of the invention, the first rotation prevention unit may include a rotation member sandwiched between the base member and the first slider, and the second rotation prevention unit may include the base member and the base member. The rotating member may be sandwiched between the second slider.

In the imaging device according to the aspect of the invention, the first rotation prevention unit includes a rotation member sandwiched between the base member and the first slider, and the second rotation prevention unit includes the first slider and the first slider. The rotating member may be sandwiched between the second slider and the second slider.

  In the imaging device according to the aspect of the invention, both the first and second rotation preventing units may include a rotating member that is sandwiched between the base member and the second slider.

  In the imaging device of the present invention, the rotating member may be a hard sphere, or the rotating member may be a roller.

  In the imaging device of the present invention, at least one of the first and second rotation preventing units may be configured by a leaf spring that connects the base member and the first slider or the second slider.

  In the imaging device of the present invention, at least one of the first and second rotation preventing members includes a hook member that connects the base member and the first slider or the second slider, the base member, and the first member. It may be composed of one slider or a compression spring that urges so as to widen the space between the second slider and the second slider.

  According to the imaging apparatus of the present invention, since the second slider for holding the imaging element is attached to the L-shaped first slider, the four-sided periphery of the second slider is surrounded by the first L-shaped slider. The camera shake correction mechanism can be reduced in size as compared with the case where the image pickup apparatus is provided, and the degree of freedom in arrangement increases, for example, it can be arranged at corners in the image pickup apparatus. Further, even when a large second slider is used as the size of the image sensor is changed, the L-shaped first slider and the base member can be shared.

  In addition, since the first rotation prevention unit and the second rotation prevention unit are provided, rotation of the first slider and the second slider with the first and second directions orthogonal to each other as the central axes is prevented. The imaging element held by the second slider can maintain a vertical state with respect to the optical axis direction, and so-called warpage can be prevented.

  Hereinafter, a digital camera which is an embodiment of an imaging apparatus with a camera shake correction mechanism of the present invention will be described with reference to the drawings.

  The camera shake correction mechanism according to the present invention is mounted and used in a digital camera 1 as shown in FIG. The digital camera 1 includes a camera body 2 and a lens barrel 3 that is an optical system including a lens 4 and the like. The camera shake correction mechanism 10 is attached to the end of the lens barrel 3. As will be described later, the camera shake correction mechanism 10 is provided with an image sensor such as a CCD. Then, as shown by the arrow 5 in FIG. 1, when the digital camera 1 is shaken during photographing and the optical axis L incident on the lens barrel 3 is shifted, the image sensor is moved as shown by the arrow 6 and the light is moved. The axis deviation is corrected.

  FIG. 2 is an exploded perspective view of the camera shake correction mechanism 10. FIG. 3 is a cross-sectional view of the camera shake correction mechanism 10 of FIG. 2 cut along the II section in the assembled state. FIG. 4 shows a cross-sectional view of the camera shake correction mechanism 10 of FIG. 2 cut along the II-II cross section in the assembled state. The camera shake correction mechanism 10 is movable in a horizontal direction (hereinafter referred to as the X-axis direction) via a first plate 28 and a base plate (base member) 12 fixed in the digital camera 1. The first slider 14 is attached to the first slider 14, and is attached to the first slider 14 via the second actuator 56 so as to be movable in a direction perpendicular to the moving direction of the first slider 14 (hereinafter described as the Y-axis direction). And the second slider 13 holding the image sensor 16.

  As shown in FIGS. 3 and 4, the base plate 12 is fixed to the lens barrel 3 by adjusting the position (turning and lens back) with respect to the lens barrel 3. The distance from the mechanism 10 can be adjusted. Further, as shown in FIG. 2, the surface of the base plate 12 is arranged perpendicular to the optical path direction (hereinafter referred to as the Z-axis direction), and the first side portion 12a and the second side are orthogonal to each other. It is L-shaped consisting of a portion 12b.

  The base member 12 is not necessarily limited to an L shape as long as it does not interfere with the first slider 14 and the second slider 13 that move in the X-axis direction and the Y-axis direction. It need not be a member.

  From the end portion of the second side portion 12b of the base plate 12, a drop-off preventing arm 24 whose tip is hook-like is erected and extends in the optical axis direction (Z-axis direction). Further, on the first side portion 12 a of the base plate 12, a weight 30, a piezoelectric element 32 that is an electromechanical conversion element connected to the weight 30, and a vibration transmission rod 34 connected to the piezoelectric element 32 are provided. The 1st actuator 28 which is an ultrasonic linear actuator containing is being fixed along the X-axis direction.

  In the first actuator 28, the tip and end (piezoelectric element 32 side) of the vibration transmission rod 34 are fitted to two rod support arms 36 provided on the base plate 12, respectively, and a weight is placed on the positioning arm 31 of the base plate 12. In the state where 30 is in contact, the fitting portion of the vibration transmitting rod 34 with the rod support arm 36 on the distal end side and the weight 30 are bonded to the base plate 12. For bonding between the rod support arm 36 and the vibration transmitting rod 34, an adhesive that remains elastic after curing, such as a silicon adhesive, is used. For bonding between the positioning arm 31 and the weight 30, a soft rubber system is used. Alternatively, a silicon-containing adhesive is preferably used.

  The two rod support arms 36 of the base plate 12 are respectively provided with protrusions 38 extending in the Z-axis direction on the upper surface thereof. As will be described later, the protrusion 38 is fitted into the movement restriction hole 79 of the first slider 14 during assembly.

  The first slider 14 is positioned on the image plane side with respect to the base plate 12 in the optical axis direction (Z-axis direction), and similarly to the base plate 12, the first side portion 14a and the second side portion 14b are orthogonal to each other. An L-shape consisting of As a result, the first slider 14 is disposed so as to overlap the base plate 12 having the same L shape with a space therebetween. Further, at the time of assembly, the drop-off prevention arm 24 of the base plate 12 is disposed at a position that can be engaged with the end of the second side portion 14b of the first slider 14, and thus, when the digital camera 1 is dropped, a strong impact is produced. The first slider 14 is prevented from falling off from the base plate 12 even if the is applied. The first slider 14 may have an L shape such that the first side portion 14a and the second side portion 14b intersect each other at an angle other than a right angle.

  The first slider 14 includes a first rod abutting portion 74 that abuts on the vibration transmission rod 34 of the first actuator 28 fixed to the base plate 12, and a vibration of a second actuator 56 fixed to the second slider described later. A second rod contact portion 76 that contacts the transmission rod 60 and a movement restriction hole 79 are formed.

  The first rod contact portion 74 is provided with a V-shaped groove 74a (see FIG. 3), and the cap 40 is used in a state where the V-shaped groove 74a is in contact with the vibration transmission rod 34 of the first actuator 28. By sandwiching the vibration transmission rod 34, the first slider 14 is slidably frictionally joined along the vibration transmission rod 34. A clamping spring 42 is used to fix the cap 40 to the first rod contact portion 74 in a state where the vibration transmission rod 34 is clamped. As shown in FIG. 5, the holding spring 42 hooks a ring portion on a pin 74 b provided on the side surface of the first rod abutting portion 74 of the first slider 14, and two engagement protrusions of the cap 40 at both ends thereof. It is attached by hooking to 40a. At this time, the contact pressure between the cap 40 and the vibration transmission rod 34 is about 5 to 6 times the spring force of the clamping spring 42 used.

  As will be described later, the first slider 14 approaches the base plate 12 by a pressing spring 70 in which hooks on both ends are hooked on pressing spring hooks 21 and 72 provided on the base plate 12 and the second slider 13, respectively. Be energized by. In order to prevent the first slider 14 from rotating about the vibration transmission rod 34 extending in the X-axis direction of the first actuator 28 by the urging force of the pressing spring 70, as shown in FIG. A first rotation prevention unit 19 is provided between the slider 14 and the base member 12. The first rotation preventing unit 19 is preferably provided in the vicinity of the end of the second side portion 14 b of the first slider 14 farthest from the first actuator 28. By arranging the first rotation preventing unit 19 in this manner, the first slider 14 is moved with respect to the optical axis direction (Z-axis direction) even when the first slider 14 is moved by being driven by the first actuator 28. The vertical state can be most effectively maintained.

  As shown in FIG. 3, the first rotation prevention unit 19 is housed in a receiving recess 20 a formed on the end surface of the protrusion 20 provided on the first slider 14 and is held between the base plate 12 and the rotation. It consists of a steel ball 15 as a member. In this embodiment, the steel ball 15 that is a rigid sphere is used as the rotating member, but a roller may be used as the rotating member instead.

  The movement restriction hole 79 of the first slider 14 is loosely fitted with a protrusion 38 provided on the upper surface of the rod support arm 36 of the base plate 12. The movement restricting hole 79 is a long hole extending in the moving direction of the first slider 14, that is, in the extending direction (X-axis direction) of the vibration transmission rod 34 by the movable width of the first slider 14. It fits with the protrusion 38 on the upper surface of the support arm 36 to restrict the first slider 14 from moving (dropping out) in the short side direction (Y-axis direction) of the movement restriction hole 79.

  The second slider 13 is a resin box having an opening 48 in the bottom wall 44, and holds the imaging element 16, the low-pass filter 17, the heat radiating plate 18, and the second actuator 56. The heat radiating plate 18 is fixed to the second slider 13 so as to be in contact with the back side of the imaging element 16 where the imaging surface is not provided and to cover the space defined by the peripheral wall 46 of the second slider 13. As shown in FIGS. 3 and 4, a first substrate 80 is provided on the back surface of the heat radiating plate 18, and the image sensor 16 is electrically connected to the substrate 80. As shown in FIGS. 3 and 4, on the back side of the first substrate 80, an infrared LED 94 for detecting the position of the second slider 13, an image sensor driver, and a photoelectric signal from the image sensor 16 are processed. A part of the element 81 relating to image signal readout of the image sensor such as a preamplifier, a color separation circuit, a white balance adjustment circuit, and an analog processing circuit is mounted.

  The low-pass filter 17 is attached in close contact so as to cover the effective imaging surface of the imaging device, and is fitted into the opening 48 of the second slider 13. At this time, the back surface of the image pickup device 16 is brought into close contact with the heat radiating plate 18 by being pressed by a close contact spring disposed around the opening 48.

  The second actuator 56 attached to the second slider 13 is bonded and held to a rod support arm 50 provided on the side of the peripheral wall 46. Similarly to the first actuator 28, the second actuator 56 includes a weight 58, a piezoelectric element 59 that is an electromechanical transducer connected to the weight 58, and a vibration transmission rod 60 connected to the piezoelectric element 59. Including an ultrasonic linear actuator. The second actuator 56 has the tip and end (piezoelectric element 59 side) of the vibration transmission rod 60 fitted to the two rod support arms 50 of the second slider 13, respectively, and the positioning surface 57 of the second slider. In a state where the weight 58 is in contact with the rod 58, the fitting portion of the vibration transmitting rod 60 with the rod support arm 50 on the distal end side and the weight 58 are bonded to the second slider 13. Similar to the bonding of the first actuator 28 described above, an adhesive that remains elastic after curing, such as a silicon adhesive, is used for bonding the vibration transmission rod 60, and a soft rubber or Silicone-containing adhesives are each preferably used.

  In the present embodiment, the second actuator 56 is attached to the second slider 13, but the second actuator 56 may be attached to the second side portion 14 b of the first slider 14.

  The second actuator 56 of the second slider 13 is sandwiched between the V-shaped groove of the second rod abutting portion 76 of the first slider 14 and the cap 75, whereby the second slider 13 is frictionally joined to the first slider 14. The A clamping spring 78 is used to fix the second rod contact portion 76 and the cap 75 in the same manner as shown in FIG. As in the case of the first actuator 28, one end 75a of the cap 75 is locked in the engagement hole 76a of the second rod contact portion 76, the central portion 75b is in contact with the vibration transmission rod 60, and the other end 75c is It is pulled by both ends of the holding spring 78. The contact pressure between the cap 75 and the vibration transmission rod 60 is about 5 to 6 times the spring force of the clamping spring 78 used.

  As described above, the second slider 13 is brought closer to the base plate 12 by the pressing spring 70 in which the hooks on both ends are hooked on the pressing spring hooks 21 and 72 respectively provided on the base plate 12 and the second slider 13 during assembly. Be energized by. In order to prevent the second slider 13 from rotating about the vibration transmission rod 60 extending in the Y-axis direction of the second actuator 56 by the urging force of the pressing spring 70, as shown in FIG. 2 A second rotation preventing portion 61 is provided between the slider 13 and the base plate 12.

  The second rotation prevention unit 61 includes a steel ball 63 that is a rotating member sandwiched between the steel ball receiving unit 62 projecting from the peripheral wall 46 of the second slider 13 and the base plate 12. The first rotation prevention unit 61 is preferably provided in the vicinity of the end of the first side portion 12 a of the base plate 12 farthest from the second actuator 56. By arranging the second rotation preventing unit 61 in this way, the second slider 13 is moved in the optical axis direction (Z-axis direction) even when the second slider 13 is moved in the Y-axis direction by being driven by the first actuator 56. ) Can be most effectively maintained. In this embodiment, the steel ball 63 that is a rigid sphere is used as the rotating member, but a roller may be used as the rotating member instead.

  When the camera shake correction mechanism 10 is assembled, the second slider 13 to which the image sensor 16, the low-pass filter 17, the heat radiating plate 18, the second actuator 56, and the like are assembled is attached to the first slider 14. At this time, the vibration transmitting rod 60 of the second actuator 56 is disposed with the V-shaped groove of the second rod contact portion 76 of the first slider 14 in contact with the second rod contact portion 76. A cap 75 is disposed so as to sandwich the vibration transmission rod 60 and is fixed by a sandwiching spring 78. As a result, the second slider 13 is attached to the first slider 14.

  Subsequently, the vibration transmission rod 34 of the first actuator 28 on the base plate 12 is disposed in a state in which the V-shaped groove 74a of the first rod contact portion 74 of the first slider 14 is in contact with the first slider 14, and at this time, the first slider The end portion of the second side portion 14 b of the base plate 14 is positioned below the tip hook portion of the drop-off preventing arm 24 of the base plate 12. Then, the cap 40 is disposed so as to sandwich the vibration transmission rod 34 between the first rod contact portion 74 and fixed by the sandwiching spring 42. Thereby, the first slider 14 to which the second slider 13 is assembled is attached to the base plate 12.

  And while putting the steel ball 15 in the steel ball receiving recessed part 20a of the protrusion 20 of the 1st slider 14 and clamping the steel ball 15 between the base plates 12, the steel ball receiving part 62 of the 2nd slider 13 and In a state where the steel ball 63 is sandwiched between the base plate 12, hooks on both ends of the pressing spring 70 are hooked on the pressing spring hooks 72 and 21 of the second slider 13 and the base plate 12. Thereby, the camera shake correction mechanism 10 is assembled.

  In the camera shake correction mechanism 10 assembled in this way, the first slider 14 can slide in the X-axis direction along the vibration transmission rod 34 of the first actuator 28, and at this time, the second slider 13 is moved to the first slider 14. The image sensor 16 fixed to the second slider 13 also moves in the X-axis direction. On the other hand, the second slider 13 can move independently of the first slider 14 in the Y-axis direction along the vibration transmission rod 60 of the second actuator 56, and the first slider 14 can move relative to the base plate 12. Since the second slider 13 cannot move in the Y-axis direction, the second slider 13 can also move in the Y-axis direction with respect to the base plate 12. Therefore, the image sensor 16 fixed to the second slider 13 also moves in the Y-axis direction.

  After the camera shake correction mechanism 10 is assembled as described above, the second substrate 82 is fixed to the substrate holding arm 22 of the base plate 12 as shown in FIGS. As described above, since the first substrate 80 is fixed to the second slider 13, both are disposed so as to overlap in the optical axis direction, and the first substrate 80 is moved to the second substrate 82 by the movement of the second slider 13. Move parallel to Both are connected by a flexible substrate 84, so that signals can be transmitted and received. The flexible substrate 84 is bent in the optical axis direction (Z-axis direction) immediately after coming out of the first substrate 80 in the horizontal direction, and is folded back into a loop shape before being connected to the second substrate 82.

  The second substrate 82 includes a circuit 83 for processing a signal from the first base 80 (that is, the image pickup device 16) such as an AD converter and a memory controller, and a position detection element 88 (hereinafter referred to as the second slider 13). And a movement control circuit for the two actuators 28 and 56 based on the PSD position signal and the angular velocity signal from the gyro circuit 86. The PSD is covered with a cover 92 with a slit in order to prevent detection errors, and the light receiving element 90 that has received light from the infrared LED provided on the first substrate 80 detects the position thereof. An angular velocity signal in an orthogonal detection direction (X axis, Y axis) is input from the gyro element 86 to the second substrate 82. The second substrate 82 outputs an actuator control signal and a processed image signal.

  Next, the operation of the camera shake correction mechanism 10 according to the present embodiment will be described. FIG. 6 is a block diagram showing the electrical structure of the drive control circuit of the camera shake correction mechanism 10.

  The control circuit detects a blur 5 of the optical axis L incident on the camera body, that is, the lens barrel 3, and outputs an angular velocity signal, and a PSD circuit that detects the position of the second slider 13 (imaging device 16). 90, a microcomputer 102 that performs overall control of the circuit and calculates a movement amount and a presence position based on an input signal, and a drive circuit that generates a drive pulse of a predetermined frequency based on a drive signal from the microcomputer 102 104. The drive pulses generated from the drive circuit 104 are output to the first and second actuators 28 and 56, and the first and second sliders 14 and 13 move along the actuators 28 and 56.

  The gyro element 86 is fixed to the lens barrel 3 as shown in FIG. 4, and detects the angular velocity in the biaxial direction (X-axis direction and Y-axis direction) when the camera body is shaken as shown by the arrow 5, and the microcomputer To 102.

  When the angular velocity signal is input from the gyro element 86, the microcomputer 102 calculates the moving amount and moving speed of the image due to the blur on the imaging element 16 (on the imaging surface) from the focal length signal of the optical system. A supply voltage having a predetermined frequency applied to the two actuators 28 and 56 is determined from the calculated moving speed and the position of the second slider 13 (image sensor 16). That is, the microcomputer 102 captures the image sensor based on the position where the second slider 13 (image sensor 16) currently calculated based on the signal input from the PSD 90 and the angular velocity signal input from the gyro element 86. 16 calculates the position where it should be, compares the difference with the current position, and performs feedback control to move the sliders 13 and 14 so that the image sensor 16 returns to the position where it should be.

  The drive circuit 104 receives a signal from the microcomputer 102 and outputs a drive pulse having a frequency of about 70% of the resonance frequency of the actuators 28 and 56. The drive pulse is applied to the piezoelectric elements 32 and 59 and moves the first and second sliders 14 and 13 along the vibration transmission rods 34 and 60 according to the following principle.

  When a sawtooth drive pulse having a gradual rise 110 and a sudden fall portion 112 as shown in FIG. 7A is applied to the piezoelectric elements 32 and 59, as shown in FIGS. 7B1 and 7B2. Furthermore, at the gently rising portion 110 of the drive pulse, the piezoelectric elements 32 and 59 are gently extended and displaced in the thickness direction, and the vibration transmitting rods 34 and 60 fixed to the piezoelectric elements 32 and 59 are gently displaced in the axial direction. To do. At this time, the sliders 13 and 14 frictionally joined to the vibration transmission rods 34 and 60 move together with the vibration transmission rods 34 and 60 by the frictional force.

  On the other hand, at the sudden falling portion 112 of the drive pulse, the piezoelectric elements 32 and 59 are rapidly contracted and displaced, and accordingly, the vibration transmitting rods 34 and 60 connected to the piezoelectric elements 32 and 59 are also rapidly axially moved. Move to. At this time, as shown in FIG. 7 (b3), the sliders 13 and 14 frictionally bonded to the vibration transmission rods 34 and 60 overcome the friction bonding force by the inertial force and substantially remain at that position and do not move. As a result, the slider moves to the right along the vibration transmitting rods 34 and 60 from the initial state shown in FIG. By continuously applying the sawtooth drive pulse to the piezoelectric elements 32 and 59, the sliders 13 and 14 can be continuously moved in the axial direction. Here, “substantially stay in that position and do not move” means between the sliders 13 and 14 and the vibration transmission rods 34 and 60 when the vibration transmission rods 34 and 60 are expanded and contracted in the positive and negative directions. Although the sliders 13 and 14 move while causing the slip, the movement amounts are not symmetrical, and therefore the sliders 13 and 14 move in any arbitrary direction as a whole.

  In order to move the sliders 13 and 14 in the left direction, the waveform of the sawtooth wave applied to the piezoelectric elements 32 and 59 is changed and a drive pulse consisting of a rapid rise and a gentle fall is applied. This can be achieved by the reverse action. Note that a rectangular wave or other waveforms can be applied to the drive pulse.

  When a drive pulse is applied to the piezoelectric element 32 of the first actuator 28 fixed to the base plate 12, the piezoelectric element 32 repeats expansion and contraction as described above. Expansion and contraction of the piezoelectric element 32 is transmitted to the weight 30 and the vibration transmission rod 34. The weight 30 hardly moves due to the difference in inertial mass between the weight 30 and the vibration transmission rod 34, and the expansion / contraction is transmitted only to the vibration transmission rod 34. As described above, the vibration transmission rod 34 is bonded to the rod support arm 36. However, since the adhesive 33 is elastically bent, expansion and contraction is not hindered. As described above, the first slider 14 that is frictionally joined by the speed difference of the rod 34 that moves to the left and right moves in the X-axis direction along the vibration transmission rod 34. As the acceleration / deceleration of the first slider 14 is applied, a force to move the first actuator 28 within the engagement play acts, but since the vibration transmission rod 34 and the rod support arm 36 are bonded, no movement occurs. It is possible to prevent not only the correction performance but also the optical performance deterioration due to focus movement.

  When the first slider 14 moves in the X-axis direction, the second slider 13 connected to the first slider 14 also moves in the X-axis direction at the same time. The second slider 13 has a resistance caused by the rolling of the steel ball 63 sandwiched between the second slider 13 and the base plate 12 by the pressing force of the pressing spring 70 applied between the second slider 13 and the base plate 12. And moves without fluctuation in the optical axis direction. At this time, the flexible substrate 84 connecting the first and second substrates 80 and 82 has a bent opening angle to absorb the movement of the first slider 14.

  On the other hand, when a drive pulse is applied to the piezoelectric element 59 of the second actuator 56 held by the second slider 13, the piezoelectric element 59 repeats expansion and contraction as described above. Expansion and contraction of the piezoelectric element 59 is transmitted to the weight 58 and the vibration transmission rod 60. Due to the difference in inertial mass between the weight 58 and the vibration transmission rod 60, the weight 58 hardly moves and the expansion / contraction is transmitted only to the vibration transmission rod 60. The vibration transmission rod 60 is bonded to the rod support arm 50 of the second slider 13 as described above, but the expansion and contraction is not hindered because the adhesive is elastically bent. As described above, the second slider 13 moves (self-runs) in the extending direction (Y-axis direction) of the vibration transmission rod 60 relative to the first slider 14 due to the speed difference between the rods moving left and right. As the acceleration / deceleration of the second slider 13 is applied, a force is applied to the second actuator 56 to move within the engagement play, but since the vibration transmission rod 60 and the rod support arm 50 are bonded, no movement occurs. It is possible to prevent not only the correction performance but also the optical performance deterioration due to focus movement.

  When the drive pulse is applied to the second actuator 56 in this way, only the second slider 13 moves (self-runs) in the Y-axis direction independently of the first slider 14. The second slider 13 has a resistance caused by the rolling of the steel ball 63 sandwiched between the second slider 13 and the base plate 12 by the pressing force of the pressing spring 70 applied between the second slider 13 and the base plate 12. And moves without causing fluctuations in the optical axis direction. At this time, the flexible substrate 84 connecting the first and second substrates 80 and 82 is bent to absorb the movement of the second slider 13.

  As described above, in the digital camera 1 including the camera shake correction imaging mechanism 10 according to the present embodiment, the second slider 13 that holds the imaging device 16 is attached to the first slider 14 that is formed in an L shape. Therefore, the camera shake correction mechanism 10 can be reduced in size compared to the case where the four-sided periphery of the second slider 13 is surrounded by the square-shaped first slider, and can be arranged at the corners in the digital camera 1. Arrangement freedom increases. Further, even when a large second slider 13 is used as the size of the image sensor 16 is changed, the L-shaped first slider 14 and the base plate 12 can be shared.

  Further, by providing the first rotation prevention unit 19 and the second rotation prevention unit 61, the rotation of the first slider 14 and the second slider 13 with the X axis direction and the Y axis direction orthogonal to each other as the central axes can be prevented. Therefore, the image sensor 16 held by the second slider 13 can maintain a vertical state with respect to the optical axis direction, and so-called warpage can be prevented.

  In addition, this invention is not limited to the said embodiment, It can implement in another various aspect.

  For example, in the above-described embodiment, the second rotation prevention unit 61 is provided between the base plate 12 and the second slider 13, but as shown in FIG. 8, the steel balls 63 that constitute the second rotation prevention unit 61. Is sandwiched between the steel ball receiving portion 62 of the second slider 13 and the first side portion 14a of the first slider 14, and both ends of the torsion spring 71 are connected to the spring hook 14c of the first slider 14 and the second slider. The second slider 13 and the first slider 14 may be urged in the direction approaching each other by the torsion spring 71. In this case, the pressing spring 70 is provided so that the second side portion 12b of the base plate 12 and the second side portion 14b of the first slider 14 are pulled in a direction approaching each other.

  Moreover, as shown in FIG. 9, both the steel ball 15 which comprises the 1st rotation prevention part 19, and the steel ball 63 which comprises the 2nd rotation prevention part 61 are the 2nd slider 13 and the base board 12 which abbreviate | omitted illustration. You may provide so that it may be pinched | interposed between.

  Moreover, in the said embodiment, although the 1st and 2nd rotation prevention parts 19 and 61 were comprised with the steel balls 15 and 63, at least 1 of the 1st and 2nd rotation prevention parts 19 and 61 is Fig.10 (a). As shown in FIG. 4, the base plate 12 and the second slider 13 or the first slider 14 may be configured by a leaf spring 51 that connects the base plate 12 and the second slider 13 or the first slider 14. The leaf spring 51 is formed by bending so as to be bent in four orthogonal directions, and can be bent as the first slider 14 and the second slider 13 move.

  Further, at least one of the first and second rotation preventing portions 19 and 61 is hung at both ends by hook hook portions 52 and 53, respectively, as shown in FIG. And a hook member 54 that connects the base plate 12 and a compression spring 55 that is disposed around the hook member 54 and urges the base plate 12 and the second slider 13 or the first slider 14 to expand. It may be configured.

1 is a schematic configuration diagram of a digital camera which is an embodiment that is an imaging apparatus with a camera shake correction mechanism of the present invention. FIG. The disassembled perspective view of a camera-shake correction mechanism. II sectional drawing of FIG. II-II sectional drawing of FIG. The side view which shows the fixing state of the cap by a clamping spring. The block diagram which shows the electric structure of the drive control circuit of a camera-shake correction mechanism. 4A and 4B are diagrams for explaining the driving principle of the actuator, in which FIG. 4A is an example of a waveform of a driving pulse applied to the piezoelectric element, and FIG. The disassembled perspective view which shows the modification of a camera-shake correction mechanism. The figure which shows the modification which provided the two rotation prevention parts in the 2nd slider. The figure which shows the two modifications of a rotation prevention part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Digital camera 2 Body 3 Lens barrel 4 Lens 10 Camera shake correction mechanism 12 Base board (base member)
13 Second slider 14 First slider 15 Steel ball (rotating member)
16 Image sensor 17 Low-pass filter 18 Heat sink 21, 72 Press spring hook 22 Substrate holding arm 24 Fall-off prevention arm 28 First actuator 30 Weight 32 Piezoelectric element (electromechanical transducer)
34 Vibration transmission rod 36 Rod support arm 38 Protrusion 40 Caps 42, 78 Nipping spring 44 Bottom plate 46 Perimeter wall 48 Opening 50 Rod support arm 56 Second actuator 58 Weight 59 Piezoelectric element (electromechanical conversion element)
60 Vibration transmission rod 63 Steel ball (rotating member)
70 Pressing spring 74 First rod contact portion 76 Second rod contact portion 79 Movement restriction hole 80 First substrate 82 Second substrate 84 Flexible substrate 86 Gyro element

Claims (13)

A base member fixed in the imaging device;
The base member is movably attached to the base member via a first actuator and has an L-shape composed of two sides orthogonal to or crossing each other. The first actuator moves along the first side of the two sides. A first slider moved in a first direction;
An imaging device that is movably attached to the first slider via a second actuator and that is moved by the second actuator along a second side of the first slider in a second direction perpendicular to the first direction. A second slider holding the element;
A first rotation preventing portion for preventing rotation of the first slider with the first direction as a central axis;
A second anti-rotation portion that prevents the second slider from rotating about the second direction as a central axis, and the base member is L-shaped so as to overlap the first slider, thereby preventing the first anti-rotation And the second rotation preventing portion is provided near the end of the second side of the first slider farthest from the first actuator, and the second anti-rotation portion is the first side of the base member farthest from the second actuator. An image pickup apparatus having a camera shake correction mechanism, which is provided in the vicinity of an end of the camera. The imaging apparatus according to claim 1, wherein the first actuator is fixed on the base member, and the second actuator is attached to the second slider . The imaging apparatus according to claim 1, wherein the first actuator is fixed on the base member, and the second actuator is attached to the first slider . 2. The ultrasonic linear actuator according to claim 1, wherein the first and second actuators are ultrasonic linear actuators including a weight, an electromechanical transducer connected to the weight, and a rod connected to the electromechanical transducer. The imaging apparatus according to 1. The imaging apparatus according to claim 4 , wherein the first slider and the second slider are friction-bonded to the rods of the first and second actuators, respectively . The imaging apparatus according to claim 5, wherein the friction joint portion is configured by sandwiching the rod between a V-shaped groove and a cap . The first rotation prevention unit includes a rotation member sandwiched between the base member and the first slider, and the second rotation prevention unit is sandwiched between the base member and the second slider. The imaging apparatus according to claim 1 , further comprising a rotating member . The first rotation prevention unit includes a rotation member sandwiched between the base member and the first slider, and the second rotation prevention unit is sandwiched between the first slider and the second slider. The imaging apparatus according to claim 1, wherein the imaging apparatus is made of a rotating member . The imaging apparatus according to claim 1 , wherein each of the first and second rotation prevention units includes a rotation member that is sandwiched between the base member and the second slider . The imaging apparatus according to claim 7, wherein the rotating member is a hard sphere . The imaging apparatus according to claim 9, wherein the rotating member is a roller . 2. The imaging according to claim 1, wherein at least one of the first and second rotation preventing portions is configured by a leaf spring that connects the base member and the first slider or the second slider. apparatus. At least one of the first and second anti-rotation members includes a hook member connecting the base member and the first slider or the second slider, and the base member and the first slider or the second slider. The imaging apparatus according to claim 1 , further comprising a compression spring that urges the gap so as to widen the gap .

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